10=-10-2r

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Solution for 10=-10-2r equation: 



10=-10-2r

We move all terms to the left:

10-(-10-2r)=0

We add all the numbers together, and all the variables

-(-2r-10)+10=0

We get rid of parentheses

2r+10+10=0

We add all the numbers together, and all the variables

2r+20=0

We move all terms containing r to the left, all other terms to the right

2r=-20

r=-20/2

r=-10

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